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在星型网络中，终端向协调器发送数据前的数据请求是通过哪个API实现的，协调器发送广播成功需要收到终端的确认帧来确定是否发送成功了吗
请参考zigbee三种通信方式：单播，组播，广播 http://blog.sina.com.cn/s/blog_6184e67b01019dbd.html
